Automatic grinding machine



Jan. 21, 1930. STE'NER 1,744,587

AUTOMA'I IC GRINDING MACHINE Filed Aug. 14, 1925 9 Sheets-Sheet 1 IN VENTOR.

By 1427? 0.9. PSZez'new TORN Jan. 21, 1930. A. P. STEINER 1,744,587

AUTOMATIC GRINDING MACHINE Amos pszfez'zzer' Jan. 21, 1930. A. PISTEINERAUTOMATIC GRINDING MACHINE Filed Aug. 14, 1925 9 Sheets-Sheet 5 Jan. 211930. A. P. STEINER AUTOMATIC GRINDING MACHINE 9 Sheets-Sheet 4 FiledAug. 14. 1925 Q g g g INVENTOR. I l/2705 PStez'nen Y ATT RNEY Jan. 21,1930. A. P. STEINER AUTOMATIC GRINDING MACHINE Fi led Aug. 14. 1925 Jan.21, 1930. A. P. STEINER AUTOMATIC GRINDING MACHINE Filed Aug. 14, 1925 9Sheets-Sheet 6 w: E /7Z INVENTOR. A2770; 2556mm? TTORN Jan. 21, 1930. A.P. STEINER 1,744,587

AIVJTOMATIC GRINDING MACHINE,

Filed Aug. 14'. 1925 9 Sheets-Sheet x7 IN VEN TOR. P516018? 1 2mm I Jan.21, 1930. A. P. STEINER 1,744,537

AUTOMATIC GRINDING MACHINE Filed Aug. 14. 1925 9 Sheets-Sheet 8INVENTOR. /4/770.5P 6%))? en d A a T ORNEY 1930- A. P. STEINER1,744,587-

AUTOMATIC GRINDING MACHINE Filed Aug. 14. 1925 9 Sheets-Sheet 9 MAE] /46w m/ W W11 m; ("7''- IN VEN TOR.

By Amos P62711762".

Q A ORNEY Patented lldftd eormnwr, @FF WAYNESBQEQ, PENNSYLVANIA, AGGRFQHATXQN Q1 IEIEEQTNSYLVMJM Application filed August 1 1, 1325.Serial life; some.

My said invention relates to an automatic grinding machine and it is anobject of the same to grind automatically small duplicate articles suchas piston pins or other articles,

5 which are made in large quantities, eliminating the usual handlingoperations by performing them automatically in the machine, allowing theoperator time to run several machines.

Another object is to provide means where- Y by the various movements ofdifierent parts of the machine giro performed hydraulically,

Another object is to provide means for urging the work toward astationary grinding wheel to produce a feeding movement as the grindingoperation proceeds.

Another object is to provide means whereloy the wheel is given a lateralreciprocating movement to remove any grinding marks caused by the wheel.

Another object is to provide a pump to supply pressure fluid to thetraversing motor, the work feeding motor, the work chucking cylinder,and the tailstoclr operating mechanism.

Another object is to provide a reservoir, in

which to store surplus pressure for use at a time when the motorsrequire the greatest amount or pressure fluid.

Referring to the accompanying drawings which are made a part hereof andon which similar reference charactersindicate similar parts, v

Figure 1 is a front elevation of my machine in a preferred embodimentthereof,

Figure 2, an end elevation viewed -from the Figure 8, an enlargedsection of the worlr chuck,

Figure 9 an end view of saidchuclr as seen from the right,

Figure 10, a section through the cam shaft and roller shaft on line-101O oil Fig 18, Figure 11, a section through the work teedinghydraulicmotor on line 11- -11 Fig. 13,

Figure 12, an enlarged view of the work carrier and sliding har, showingthe position old the stops when viewed from the under- $1 e, l

Figure 13, an end elevation of the feeding means and worlr drive whenviewed from the right,

Figure 14:, a sectional plan of the fluid motor for the work teed,

Figure 15, a vertical section through the piston valve or said fluidmotor, V

Figure 16, an end elevation of the work tahle and the work chuckoperating means when viewed from the left in Fig. 1,

Figure 17, a section showing the valve and operating means for the worlrchuck,

Figure 18, a right hand elevationof the swivel table, swinging bracket,and tailstock operating means,

Figure 19, a sectional plan of the tailstoclr operating cylinder andvalve and operating means,

Figure 20, a vertical section through the feeding means and magazineshowing the work in grinding position,

Figure 21, a vertical section through the feeding means and magazineshowing the work out of grinding position.

Figure 22, a section through the feeding means showing the work carrierin retracted position.

In the drawings reference character 25,

(Figs. 1 and 2) indicates a frame of any desiralole form for supportingthe various operating elements as hereinafter described, A wheel base 26mounted on said frame supports a grinding wheel 27 and is mounted uponsuitable guides for adjusting the wheel toward and away from the worlrby the manually-operated teed wheel 28 all in a manner well known tothose familiar with the construction of grinding machines.

dtl

fill

clutch member 36 which member may be.

forced into engagement with a corresponding clutch face on the wormwheel by means.

of a screw 37 abutting at one end against a pin 38 carried by clutchmember 36 and provided at the other end with a button or hand wheel 39.A collar 40 on the screw coacts with the ca 40' to prevent accidentalremoval of t e screw and the screw has threaded engagement in a bore inthe shaft 34.

A pair of eccentrics 41 on the shaft 34 engage yokes 42 pivoted to studs43 on the housing 44, the upper end of each yoke being connected by alink 45to a collar 46 which is loosely mounted on a reduced portion ofthe wheel spindle 30 and is held a ainst movement lengthwise of theshaft by hardened steel thrust collars 47 which are located at oppositesides of the collar 46 between a shoulder at one end of said reducedportion and a nut 48 engaging a threaded part of the shaft whichthreaded part is of still smaller size and said nut being adjustable forwear.

In operation the revolving spindle 30 slowly turns the shaft 34 and theeccentrics 41 rock the yokes 42 and through the links 45 and the collar46 they cause the wheel s indle and the wheel to traverse slowly bac andforth to eliminate grinding marks caused by the wheel standing in oneposition relatively to the length of the work. To render this deviceinoperative the clutch is disconnected by turning the button '39 to backoff the screw 37-.

A ump 49 is located in the base of the machine above a reservoirformedin said base which reservoir serves as a supply for the oil orother liquid for operating the various mechanisms hereinafter described.The pump, which is driven by a chain 50 from the main drive shaft 29,receives the oil from the tank through a suction pipe 51 and delivers itthrough apipe 52 with a rigid branch 53 and flexible branches 54 and 55to various mechanisms hereinafter described.

The traversing motor 56 and its connections to the work carriage aresimilar to the parts described in detail in my co-pending applicationNo. 721,292, filed June 20, 1924 which matured into U. S. Patent No.1,662,546, issued Mar. 13, 1928, and therefore it will be but brieflydescribed here as operating the gear 57 for traversing the work carriageback and forth. The purpose of such traverse in this application ismainly for dressing the grinding wheel, but it may be used to grindlonger work than the width of the wheel and the short reciprocation ofthe wheel spindle will cover.. The throttle valve 56', the operatinglevers 57 and 58 and the work speed change 82 are also similar to theconstruction described in de tail in the above named application, andwill therefore be but briefly referred to here.

A work carriage 58 is mounted for reciprocation upon guides on the upperpart of the frame 25, said carriage bearing a'rack 59 movable by thegear wheel 57 for traversing in the direction of its length. A swiveltable 60, (Figs. 7 and 13) is mounted upon said carriage and istrunnioned at 61 for swivelling to correct any mis-alignment of thework-supporting means. Mounted upon the swivel table (Figs. 7 and 13) isa magazine bracket 62 whichbears the work carrying heads. I Said bracketis mounted to swing about a horizontal axis, the bracket having two ormore depending arms secured to shaft 63 for oscillation therewith inbearings 64 on the swivel table, or being loosely mounted on the shaftto oscillate thereon. The bracket is actuated by a cam 65 on a shaft 66operating againstthe rollers 67, which are supported by the shaft 68(Figs. 10 and 13).

The cams 65 swing the bracket 62, with which the head and tail stocksare integral,

together with its trunnion 63 for a feeding movement of the work 70against the grinding wheel 27 at the proper time in appropriately timedrelation with the movements of other parts of the machine as hereinafterdescribed.

The camshaft 66 is driven'by an electric motor 71 mounted on a base 72on the swivel table 60. Sprockets 73 and 74 connected by a sprocketchain 75 are mounted respectively on the motor shaft and on a shaft 76provided with a worm gear 77 meshing with a worm wheel 78 fast on ashaft 79. Another gear 80 fast on this shaft has teeth engaging a gearcasing for the gearing between theshafts 76 and 66. The operation of themotor 71 thus rotates the camshaft which swings the magazine bracket toimpart to the work a feeding movement toward and from the wheel, thedownward and outward movement being under the action of gravity whichmay be augmented by a spring if desired. The motor is driven by anyconventional or desirable means. I

The drive for the work is transmitted from the main drive shaft 29 tothe change speed gearing indicated at'82 by means of a belt 83.Different speeds may be obtained at this point by operating thegear-shifting lever 84 (Fig. 1). Power is transmitted from thechangespeed gearing through a sprocket chain indicated at to a slidingshaft 86 rovided with sprocket gears 87 and 88 ig. 7). A sprocket chain89 connects sprocket 88 to a sprocket 90 on a shaft 91 journaled at oneend in a bearing in the trunnion shaft 63. Another sprocket 92 on thisshaft transmits the drive to the headstock spindle 93 by way of asprocket chain 94 and a sprocket 95 on said spindle. The sprockets 90and 92 are thus located on the axis of the trunnion shaft 63 so that theswinging action of the bracket 62 during the work feeding movement doesnot change the sprocket centers and thus interfere with the properworking of the driving sprocket chains. It will be recalled that theheadstock 96 and the tailstock 97 are integral with the bracket 62,therefore the distance between sprockets 92 and 95 remains the same atall times and the spindle 93 is driven in a uniform and steady mannerwhile grindmg.

The headstock 96 has spaced bearings in which the spindle 93 isrotatably mounted and the work 70 (Figs. 7 and 8) rotates with thespindle, being held on the spindle by the fingers 98 of 21 Chuck 99.Fingers 98 are fulcrumed on pins 100 and are normally held in an openosition by springs 101. A coneshaped plunger 102 operates against thebeveled rearward extensions of the fingers 98 and serves, when movedtoward the left, to close the fingers and hold them securely in closedposition. To compensate for the angular change in position of thefingers as the chuck jaws 103 move inward toward the work or vice versaand to cause said fingers to bear evenly on the cone shaped plunger 102,each finger is provided at its rear end with a hemispherical seat for ahemispherical shoe 10% held by a screw 105 which screw asses looselythrough a hole in the finger and permits the block to adjust itselffreely so as to bear evenly at all times against the hemispherical surface of its linger. The plunger 102 is connected to a piston 106 of areciprocatory fluid motor by means of a rod 107. The piston 106 isencased in a cylinder 108 closed at the ends, said cylinder beingsupplied with fluid under pressure by means of a conduit 109 and ports110 for closing the chuck. The fluid pressure is exhausted through thesame conduit when the chuck is to be opened. The cylinder is closelysealed, and a casing 111 is provided thereabout for catching any oilthat leaks out, the casing having a drain opening at 112 whereby suchoil may be removed and returned to the main tank or otherwise employed.

it is obvious that the headstock spindle 93 and the cylinder mustrevolve, while the conduit 109 is stationary. l/Vith this end in view arevolving joint is provided between said parts said joint comprising aninner revolving sleeve 113 which screws into the piston 106, an outercasing 11 and a head 115 attached to the conduit 109 and arranged tocompress packing 116 between said head and said outer casing so as toallow no fluid to escape. The pressure of the oil in the fluid pressuresystem keeps the shoulder on the sleeve 113 against the casin 114 andthe nuts 113 restrict the longitudlnal movement of the sleeve, but arefree enough to allow the same to revolve.

As above indicated the chuck 99 is closed by fluid ressure. For thispurpose the pump 49 supp ies pressure fluid through the pipes Y52 and 55to therbalanced piston valve 117 (Figs. 16-17) The piston 118 isoperated in one direction by a cam 119 on the cam shaft 66 admittingliquid from the pipe 55 through the port 120 and the pipe 109 to thecylinder 108 (Fig. 7) against the piston 106 which pulls back the coneplunger 102 causing the aws 103 to grip the work 70.

For opening the chuck the following mechanism is provided: The piston118 is biased to move in the direction opposite to that for admittinpressure to close the chuck by means 0 a spring 121 which forces thehead 122 of the piston against the free end of a rocker 123 pivoted at124 on a fixed part of the machine, and the piston is so moved when thecam 119 reaches the point in its rotation where the depression 125 inthe cam is immediately in the path of the head 122 of the piston. Atsuch time the piston will take the position shown in Figures 16 and 17in which the oil will be exhausted through the rigid pipe 126 andflexible pipe 127 to the tank by means of spring 128 acting through rod10'? upon piston 106 as the spring 128 (Fig. 8) retracts the coneplunger 102 permitting sprin 101 to swing the clutch fingers 98 in thedirection for opening the chuck jaws thereby releasing the work 7 0.

The tailstock 97 (Fig. 7), being cast integral with the bracket 62 topreserve its alignment with the headstock 96 must have its centeroperated in synchronism with the headstock chuck, so that when the work70 is released by the fingers 98 the tailstock center 129 will recedesimultaneously to release said work.

For actuating the tailstock center to perform such operation thefollowing fluid-pressure-operated mechanism is provided, reference beinghad to Figures 1, 7, 18 and 19:

An upwardly extending arm 130 is secured on a rearward extension of thetailstock spindle and is restricted in its movement by collars 131, saidarm being connected at its upper end to the rod 132 of a piston 133 bycollars 13 1. The piston operates in a. cylinder formed in a casing 135which may be unitary and accommodates both the piston and a controllingvalve therefor hereinafter described. The cylinder receives pressurefluid by way of pipes 54%, 136 andlili' which pressure lluid moves thepiston to withdraw the tailstoclr center Work, the piston end its coeciicerts "orniing rsciprocstoiy fluid "motor 1 r eositi "ling lheteiistcclr spinclle,

The cylinder and valve casing 35 car ies helencecl pision valve 189 forthe o erasing mechanism of the U C is operebed in oneiireciorediniitingpressnrefluicl l encl i9) is the s piston 133 21mlthus rerelease El e Work. ed in the cp sosiie ciirection r xheusbinpressure she foot so A f,

c TJGKlK-SZDH As We reel: es the hlocis oe rack serilres blOC-iK o cs.es ihe complete file Work into the dotterl- Ql. A segmeni gear 14-9 isadjustabl 155 o means of a bolt having its hemi in en undercut 1e gear.

mil; 158 ieclrs the adjusted @osition, enci the free end the eels e es shole in a collar 159 sein any suiielole manner. iifi iisilfilel i 0; hesegment gear about she shaft ecsitloris toe reek encl the work carrierreleiively the WOIlK center 129 and the chuck The shaft 155 is the drivesheila of cillsting ii rlrsulic motor (Figs. 11, encl 15} which operatesthe eutomeic ieeclg; mechanism by which the Work is fe i from magazineto the grinding means and then of the machine. This motor comprisesesing 280., a cover 161., a blade huh 162, sleds 163 and means arrangedto sltersly erimit pressure fluid on either side of blade 163 foroscillating the shaft 155 the gear segmeet T controlling means "for themagazine ting motor includes e helenceii piston Figs. 13 and 15} l1ousei in the g 160, said valve being movable one direction by the abutment166 having "Len sdjustehiy niounceci a boss cl the bottom of a container175 on ve table and in contrary direc- Loe spring ckelb 652 is by hecams e 16 1- is opened by bringing the inst the abutment 166 causing somove so as to allow sssre to enteshy Way of the iipe 1e port 169revolving the hlecle 163 w 1S sensing clocmvi e direction in E1QZLZ1ZRattachment to 7-0 in to the we- 16 mild at @119 o as? depositing theWork between she centhe earns revolving, cause he bracket the valve 16%travels by i a he expansion is spring 135 the 169 is open iiQ feed pipe170 smi the port 169 is open Lo the exhaust pipe 172 whereupon thehlecle is caused to revolve in e COUR'iZGlClOCk: Wise direction, whichcauses the segment gear 45 1 i0 retract the reek M9 the bar 148,hereepori ihe Work carrier 1 2 heing no onger supported by pressure cfthe seek M9 'einse ihe abutment 150 (hops clown into e position shown inFig. 22 clearing the work en returning to position under the magazine asshown in Fig. 20.

space between the end of the rack and the rear block 151 is provided sothat during thsiirsl, port oi? the retracting movement of the Tech 149it moves over against seicl rear hlock out of contact with the frontblock 150 and the work carrier 152. This allows said carrier room todrop away from the work.

as shown in Figure 22. Also'on the forward Having thus fully describedmy said invention, what I claim as new and desire to secure by LettersPatent is:

1. A grinding machine comprising an abradin device, a headstock, atailstock, a worktable, a pivoted bracket thereon carrying the headstockand tailstock, Workholding means on the headstock and tailstock, amagazine, means for oscillating the bracket to feed the workholdingmeans toward and from the abrading means, means for bringing theworkholding means and the abrading device into and out of operativerelation, means for replenishing the work while said devices are out ofoperative relation including a fluid motor on the bracket, a valvecontrolling the entry of pressure fluid, a fixed abutment for movingsaid valve during the oscillation of the bracket to admit fluid to themotor, a camshaft on the carriage, cams on the camshaft for oscillatingsaid bracket, and a motor on the carriage for driving said camshaft. i

2. In a grinding machine, a wheel, a headstock, a tailstock, workholdingdevices on the headstock and tailstock, fluid motors operatin saiddevices, a magazine, means for feeding articles from the magazine to theworkholding devices including a fluid motor, valves controlling theentry. of fluid to each of said motors, a camshaft, connections from thecamshaft for operating each of said valves, a bracket supporting theheadstock the tailstock and the magazine said bracket being pivoted tomove the work toward and from the wheel, and cams on said camshaft formoving the bracket on its pivot, substantially as set forth. A

3. A grinding machine including a wheel, workholdin means, a magazine,means for imparting feeding movement to the Workholding means, a barreciprocating between the magazine and the workholding means, a pivotedlip on the bar, a rack having lost motion connection to the bar to raisethe lip on movement toward the rear of the machine and drop it onreverse movement, a pinion engagin the rack, a shaft carrying thepinion, a bladeon the shaft forming the rotor of a fluid motor, and afixed casing about said shaft and blade, substantially as set forth.

a. A grinding machine comprising a grinding wheel, work holding means,means to supply work to the workholdin means comprising sliding membersmova le with recarrying devices, rack teeth on said second.

member, a gear segment engaging said "rack,

means tor rotating said gear segment some rately through a distancesufiicient to place the work in grinding osition, and means wherebyrotation of said segment in one direction holds said workdevice inoperative position and rotation in the opposite direction allows saiddevice to return to inoperative position, substantially as set forth.

5. A grinding machine comprising a grinding wheel, workholding means,means to supply work to the workholding means comprising sliding membersmovable with respect to each other, a positive stop on one of said'members, a work carrying device pivoted to said member, said stop andsaid device being adapted to engage a secondsliding member, lost motionbetween said members limited by said stop and said work carrying device,rack teeth on said second member, a gear segment engaging said rack,means for rotating said gear segment accurately through a distancesuflicient to place the work in grinding position, and means wherebyrotation of said segment in one direction places the work in grindingposition and rotation in the op osite direction releases said work tothe work holding fixture, sub stantially asset forth.

In witness whereof, I have hereunto set my hand at Waynesboro,Pennsylvania, this thirty-first day of July, A. D. nineteen hundred andtwenty-five.

AMOS P. STEINER.

